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(No Model.) 7 2 Sheets-Sheet 2.

J. W. 'EASTON.

DYNAMO ELEGTRIG MACHINE.

No. 368,128. 7 Patented May 17, 1887.

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UNITED STATES PATENT OEEIcE.

JAMES W. EASTON, OF NEW YORK, N. Y.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 363,128, dated May 17,1887.

Application filed July 3, 1896.

To all whom, it may concern.-

Be it known that I, JAMES IV. EASTON, a subject of the Queen of GreatBritain, residing in New York, in the county and State of New York, haveinvented certain new and useful ImprovementsinDynamo-ElectricGenerators,of which the following is a specification.

My invention relates to the construction and method of organizingdynamo-electric generators.

The objectof the invention is to so organize two or more dynamo-electricgenerators and their circuits that currents of different character maybe derived therefrom, while the ma chine will be to a certain extentautomatically regulating.

In carrying out the invention the neutral plate of one generatorpreferably serves as the neutral plate of the second. The field-magnetcoils of two or more of the generators are connected in circuit with oneof the armatures, and supplementary coils are employed upon thefield-magnets of one or more ofthe generators as regulating-coils byincluding them in the circuit of another armature.

In the accompanying drawings, Figure 1 is a side elevation, partly indiagram, illustrating the construction of the machine and organiza tionof the circuits; and Fig. 2 illustrates a modification.

Referring to the figures,A represents a shaft, upon which there arecarried, in this instance, two armatures, A and a. The armature Arevolves in a field established by two polepieces, 13 and B, derivedfrom the field-magnets C/ and 0 respectively. The field-magnets areconnected by neutral plates D and I) in the usual manner. The armatureis provided with a suitable commutator or collector, E, having brushes Fand F. Conductors 1 and 2 lead from these brushes respectively throughthe coils G G and G G of the field-magnets; and in the circuit there isincluded a workcircuit, L, which, in thisinstanee, is represented asbeing employed for operating arc lights M M. From the neutral plate Dthere are derived field-magnets c 0, having pole-pieces b and I) appliedto the armature a. Aportion, g g,.of the coils of these field-magnetsare included in the circuit of the armature A in series with the coils GG and G G. In this manner the neutral plate D serves as a neutral SerialNo. 207,041. (Nomodeld plate for both sets of field-magnets, and themain magnetizing effectfor the fieldunagnets b and b is occasioned bythe currents from the armature A.

The armature a and its field-magnets are represented in this instance asbeing smaller than the armature A and its field-magnets; but the two maybe of the same size. The armature A is represented as supplying eurrents forthe arc lights, and the currentsrequired for this purpose aretherefore constant in quantity. The armature a supplies currents forincandescent lighting, the lights m at being included in multiple arebetween conductors Z Z leading from the respective brushes f and f",applied to the commutator-or collector e of the armature a. The currentsrequired for incandescent lighting are of constant electromotive force,or, in other words, the difference of potential between conductors Z andZ is rcquired to be constant. For this purpose the field of forceapplied tothe armature a should be to some extent automaticallyregulating. This is accomplished by including a section, 9 g", of thecoils surrounding thefield-magnets b andb in the circuit of the armaturea, as shown. In this manner variations in the current flowing throughthe translating-circuit Z Z will occasion variations in the strength ofthe field applied to the armature a and com pensate for the increasingand decreasing of the current in the armature-coils.

If desired, the arrangement'of circuits may be reversed, themagnetizing-coils of the fieldmagnets of the larger armature beingincluded in the circuit of the smaller armature, and a portionsufficient to regulate the current from the larger. armature included inits circuit in series.

In Fig. 2 a method of winding isillust-rated, in which the currents fromthe armature ctare employed to excite thefield-magnets of the armatureA, while the coils g g of the smaller field-magnets are included in theworking-circ'uit of the armature A. In this manner the currents from thearmature A will counteract their own disturbing effect by increasing ordecreasing the field of the exciting-armature a,which in turn will varythe current through the coils G G and G G By this construction a lessamount of wire is required in the circuit of the armature A toaccomplish the same end as results from including the coils (t G and G2G in the circuit of the armature A.

In the construction shown in Fig. 2 the arc lights are included in thecircuit of the armature a,\vhieh is a constant-current circuit, and theineamleseentlights are supplied by the constant potential currents fromthe armature A.

I claim as my invention-- 1. The combination, with two field-magnets andtheir respective armaturcs, the one organized to deliver currentsconstant in quantity, and the other to deliver currents of a constantelectro-1notive force and variable quantity, of a circuit derived fromthcarmatu re delivering currents of constant quantity ineludinga portionof the field-magnet coils of the other :11 mature, and a circuit derivedfrom the lastnamed armature incl uding the remaining coils of itsfield-magnet.

2. The combination, substantially as hereinbeforc set forth, of twoarniatures, one delivering currents constant in quantity and of variableclectro-motive force, and the other deliveringcurrcntsofconstantelectro-rnotive force,

their respective fieldinagnets, magnetizingcoils applied to both of saidfield-magnets, a circuit derived from the first-nan1ed armatureincluding all of its own field-magnet coils and a portion of thefield-magnet coils of the other armature, and a circuit derived from thesec oud armature, including the remainder of its own field-magnet coils.

3. The combination of two arinatures, their respective ficld-1nagncts, acircuit derived from one of said armaturcs, including a portion of thefield-magnet coils of the other armature, and a circuitdcrivedl'ronithesecond armature including the remaining portion of saidfieldnntgnet coils and all the tieldanngnct coils of the first-namedarmature.

In testimony \vhereot'l have hereunto subscribed my name this 25th dayof Way, A. D. 1886.

JAMES \V. E:.\STON.

Vi tnesses:

Tnos. TRYO N, CHARLES A. TERRY.

